A vulnerability has been found and corrected in perl:

The (1) lc, (2) lcfirst, (3) uc, and (4) ucfirst functions in Perl
5.10.x, 5.11.x, and 5.12.x through 5.12.3, and 5.13.x through 5.13.11,
do not apply the taint attribute to the return value upon processing
tainted input, which might allow context-dependent attackers to bypass
the taint protection mechanism via a crafted string (CVE-2011-1487).

Packages for 2009.0 are provided as of the Extended Maintenance
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The updated packages have been patched to correct this issue.